Blowlamp



L. LEVIT BLOWLAMP Jan. 30, 1940.

Filed July 8, 1936 Patented Jan. 30, 1940 T U -NlTE-D STATES or Flee YBLOWLAMP Leopold Levit, Prague, ozeehtsmvskia Application July s, 1936, sen-taint. 89,681 In CzechoslovakiaJuly "25, 1935 8 Claims.

Ihis invention relates to blowlamps of the type comprising a vaporizer for producing the impinging flame, and consists essentially in associating with the vaporizer a heater which likewise produces a stiff fiame.- In this manner not only is the thermal efficiency of the lamp improved, that is to say the fuel consumption reduced, but the possibility is also provided of using the lamp in any desired position, since the heating flame always remains directed against the vaporizer ir-v respective of the position of the lamp as a whole. At the same time the heater and the vaporizer can be placed so close to each other that the heating flame does not assume the typical pointed shape of a blow-pipe flame but merely piays round the vaporizer. What is essential to the invention is that there shall be blown flames that is to say flames fed by fuel emerging under pressure, and that the nozzles or discharge orifices of the heating device and of the vaporizer shall be facing each other.

Forms of construction embodying the invention are shown, by way of example, in the accompanying drawing Which forms part of this specification, and in Which:

Fig. 1 shows a blowlamp in accordance with the present invention, in side elevation, and partly in longitudinal section.

, Fig. 2 is a view similar. to Fig. 1 of a'modification; and

Fig. 3 is a fragmentary elevation of a further modification.

Referring to Fig. 1 of the drawing, the heating device comprises a tubular casingforming a heater 1 into which a sleeve 2 is slidably and ro:-.-

'tatably fitted. The extent to which this sleeve can be slid into the outer casing or shell is limited by stops 3 provided onthe sleeve. Into the sleeve 2 there is inserted a round tubular wick 4 which extends into the lowerpart of the casing or heater I. The upper part of the wick 4 is arranged to encase a member 5 having an outlet orificefi at the side. This member is preferably in the form of a hollow sleeve closed at the upper end which 0 projects from the end of the wick hosed. Into the lower, open end of this member there is inserted the end of a simple or multiple cord wick l which is passd through the hollow wick 4.; The oriflced sleeve member 5 is further provided with a distancing rod 8 which extends through the entire length of the casing or heater l and bears against the bottom thereof for the purposeof retaining the member 5 in its correct relative po-' sition and preventing the same from becoming forced inwards. The upper end of the cord wick I is spaced from the top of the sleeve 5 toprovide a vaporizing chamber therein. The adjustability of the sleeve 2 serves to admit of regulating the flame from. the wick 4 and of allowing for the burning away of this wick. A cap 35 is provided as a protection for the burner orifice member '5 when not in use.

The second main part of thelamp, the vaporizer, consists of a closed tubular shell formed of the lower part 9 and upper part '10. The upper part it is filled with suitable absorbent material H, for example cotton-wool or cotton-waste, which extends into the lower part 9. This filling is attached by its upper end to a distancing member l2 which bears against the upper end or head of the part ill of the shell; The head end of the shell is thus kept free from the filling material and constitutes a vaporizing chamber l3. This chamber is provided at the side with an orifice or nozzle M.

The two tubular shells i and 9 are connected together in spaced relation by means of a dual holder E5 in which the shells can be longitudinally displaced relatively to each other to any desired extent and rotated about their own axes.

The holder is slida'ble on both shells, toenable the conducting of heat from the vaporizer shell 9 to the heater shell I to be regulated.

The mode of operation of the lamp is as follows: v 30 Fuel (for example spirit) is poured into the shells l and 9, and this fuel, afterthe apparatus is assembled, is absorbed by the twowicks 4 and l and by the filling material H. The fuel vapor proceeding from the wick 4 at the upper end of the sleeve .2 is then ignited. The flame thus maintained heats the vaporizer member 5, with the result that fuel vapor issues under pressure from the orifice, 6, becomes ignited by the flame from the wick l and forms a stiff flame l9. This auxiliary blown flame impinges against the vaporizing chamber 13 forming part of the shell 9, with the resultthat rapid vaporization of the fuel in this chamber takes place. Thefuel vapor thus generated issues under pressure from the orifice i l and becomes ignited by-the flame 19, thus forming the main or working impinging 'flame'ZQ. Since the main impingingflame 20 passes through both the wick flame and the auxiliary impingingflame l9 the jet of gas issuing from the orifice or nozzle i l is always re-ignited if ever the working flame becomes interrupted or extinguished, so that the continuous functioning of the latter is ensured. The main or working flame can be so directed that it partly impinges against the upper part of the vaporizer member 5, thus intensifying the vaporizing action in this member and consequently increasing the heating of the main vaporizing chamber 13 and thereby producing a stronger working flame. By longitudinal displacement of the shell 9, I0 relatively to the shell I, the main impinging flame or working flame 20 can be altered in shape, so as to make this flame more spread out or more concentrated, as required. Difierent effects can likewise be obtained by rotation of the shell I so that the heating flame I9 impinges against different parts of the vaporizing chamber l3. If work is to be interrupted, the two shells are turned so that the flames l9 and 20 are approximately parallel to each other, the working flame 20 being thereby extinguished. The described construction of the lamp enables very high temperatures to be obtained with low fuel consumption, the temperature of the working flame produced being suflicient for soldering, brazing, welding, melting, heating, burning oif paint, re-

moving the wax from skis, and many other purposes. In addition, the lamp has the advantage that, on account of the stiffness of the flames l9 and 20, it can be used in any position.

It is advisable to make the head piece It] from material of inferior heat radiating power, that is to say for example from copper, brass, or aluminium, so that the heat supplied to the vaporizing chamber l3 by the heating flame may be utilized to the full in this chamber, with the least possible dissipation. Aluminium is more particularly well suited for this purpose, on account of its ready deformability. I have found that if such material be used it is generally not necessary to taper the vaporizing chamber, since the reduction thereby effected in the heat loss due to radiation is sufficient in itself to ensure rapid and powerful heating up.

. The connection or joint between the head I0 and the shell of the vaporizer can be of various types. 1

On the sleeve 2 (see Fig. 1) there is preferably provided an igniting device 29 which may be permanently or detachably mounted thereon. The apparatus can be mounted on a base 3|.

Fig. 2 shows a form of construction in which a number of details are modified. The wick 4 is provided with a braking spring 36 which prevents this wick from slipping in the casing I, and thereby enables the distancing stem 8 (Fig. 1) to be dispensed with. This spring is formed of a piece of wire which is passed through the wicks 4 and 'l, and which bears resiliently against the inner wall of the casing I; the spring 36 thus also fixes the positions of the wicks 4 and 'l relatively to each other. In order that the wick may not collapse or double up in its length when being displaced it is made from stifi material or reinforced by having stifiening material incorporated with it.

At the upper end of the wick 1 there is slidably fitted a sleeve 37. On the sleeve 2 telescoped in the casing I there is likewise fitted a sleeve 38 which is guided on the outside of the sleeve 2.

The telescoped sleeve 38 serves for regulating the flame burning from the wick 4, for which purpose it is pushed down to permit the flame to be lit, after which it is moved upwards to such an extent that it extends beyond the upper edge of the wick 4, so that not the liquid fuel contained in the wick but the fuel vapor above the wick burns.

"Fine adjustment of this nature can be more readily effected with the sleeve 38 than with the sleeve 2 in the form of construction shown in Fig. 1. The sleeve 31 serves as a guide for upper end of the telescoped sleeve 38. In order to increase the heat of the flame perforations 39 are provided in the sleeve 38 for the admission of air. This is possible because no over pressure exists within the shell 38 except as confined within the shell 5.

In the vaporizer the wick l l is so disposed that it is a close fit in the upper part thereof, by being quadruply folded, while its lower end, which is immersed in the fuel contained in the lower part .9, can remain loose. The result achieved by this measure is that the fuel drawn up by the wick is more rapidly vaporized by the action of the burner flame, without the power part 9 of the casing becoming hot. The tight fitting or stuffing of the wick H in the tapered part ID of the vaporizer also enables the distancing member l2 (Fig. 1) to be dispensed with. The portion of the wick material ll extending into the head H1 is surrounded by fine mesh wire gauze I la. The upper end of the vaporizer shell 9 is reinforced by a ring 4'10 to stand the strain due to heat and expansion of the head ill.

The main impinging flame or working flame of the blowlamp can be regulated by varying the distance between the vaporizing chambers 5 and 53. For this purpose, in the form of construction shown in Fig. 3 the outer fitting ring 4| carrying the vaporizer 5 of the heater has this vaporizing chamber 5 mounted eccentrically, so that by mere rotation of this ring the clearance between the vaporizing chambers can be varied. The spring 36 prevents the chamber 5 from turning, thereby preventing the auxiliary flame from the vaporizing chamber 5 from missing the chamber l3 as the fitting ring 4| is turned. Thus, the ring 4| merely rotates around the chamber 5 as it moves said chamber about. At the extreme side positions of movement, the flame from the chamber 5 barely hits the chamber l3 and the lowest working flames are generated from these positions. With this form of construction the further advantage is obtained that the lamp can be tilted to a greater extent without causing fuel to flow out.

I claim:

1. A blowlamp including a fuel tank and an orificed vaporizing chamber, at least one heater for said chamber, said heater including a tubular casing comprising a fuel receptacle, means connecting said casing to said blowlamp in spaced relation thereto, a sleeve slidably and rotatably fitted on the upper end of said casing and providing an extension thereof, means'limiting the sliding movement of said sleeve in one direction, a tubular wick carried within said casing and having its upper end normally extending beyond the upper edge of said sleeve, a tubular member having a closed upper end carried by said wick inwardly thereof, the upper end of said member extending above the upper end of said wick, the upper end of said member being formed to provide an orifice therein facing said blowlamp, a second wick carried within said member, the upper end of said second wick terminating short of said closed end of said member to provide a vaporizing space therein, whereby heat from said first wick heats an outlet orifice at the side, said heater comprising a sleeve closed at the head end and being formed to provide an outlet orifice at the side, a wick for supplying fuel to the said sleeve, a hose Wick for heating said sleeve, the sleeve being formed to provide a flame outlet orifice in the side thereof facing said orifice of said lamp so that the blowlamp flame crosses the flame of the heater and the flame of the hose wick.

3. The structure of claim 1, the casing of said heater comprising at least three concentric parts fitting one within the other, the said parts being adjustable relatively to each other to regulate the flame of said heater.

4. A blowlamp as claimed in claim 1, said heater comprising a vaporizing sleeve, a fuel feedin cord wick extending up into the said sleeve, a hose wick around the said cord wick and part of said vaporizing sleeve, a tubular shell and slidable thereon to regulate the flame thereof encasing said wicks and sleeve, and an outer sleeve fitted over the upper end of the said hose wick.

5. A blowlamp as claimed in claim 1, said heater comprising a vaporizing sleeve, a fuel feeding cord wick extending up into the said sleeve, a hose wick around the said cord Wick and part of said vaporizing sleeve, a tubular shell encasing said wicks and sleeve, and a braking posed eccentrically to the lower portion thereof,-

said lower portion fitting within the next sleeve below, said upper end of the topmost sleeve surrounding and supporting said wick.

7. A blowlamp including a fuel tank and an orificed vaporizing chamber, at least one heater for said chamber, said heater including a tubular casing comprising a fuel receptacle, means connecting said casing to said blowlamp in spaced relation thereto, a sleeve fitted on the upper end of said casing and providing an extension thereof, a tubular wick carried within said casing and having its upper end normally extending beyond the upper edge of said sleeve, a tubular member having a closed upper end carried by said wick, inwardly thereof, the upper end of said member extending above the upper end of said wick, the upper end of said member being formed to provide an orifice therein facing said blowlamp, a second Wick carried within said member, the upper end of said second wick terminating short of said closed end of said member to provide a vaporizing space therein, whereby heat from said first Wick heats said last named chamber to cause vaporized fuel to be expelled through said orifice under pressure, thereby creating a blow-pipe type of fiame directed against the vaporizing chamber of said lamp to heat the same.

8. A blowlamp including a fuel tank and an orificecl vaporizing chamber, at least one heater for said chamber, said heater including a tubular casing comprising a fuel receptacle, means connecting said casing to said blowlamp in, spaced relation thereto, a sleeve slidably and rotatably fitted on the upper end of said casing and providing an extension thereof, means limiting the siiding movement of said sleeve in onedirection, a tubular wick carried within said casing and having its upper end normally extending beyond the upper edge of said sleeve, a tubular member having a closed upper end carried by said wick inwardly thereof, the upper end of said member extending above the upper end of said wick, the upper end of said member being formed to provide an orifice therein facing said blowlamp, a 1

second wick carried within said member, the upper end of said second wick terminating short of said closed end of said member to provide a vaporizing space therein, whereby heat from said first wick heats said last named chamber to cause vaporized fuel to be expelled through said orifice under pressure, thereby creating a blow-pipe type of flame directed against the vaporizing chamber of said lamp to heat the same, the upper end of said sleeve having a sliding fit on said tubular wick, said sleeve comprising means for regulating the flame of said tubular wick.

LEOPOLD LEVIT. 

